判断当前网络是否可用和调用系统设置wifi界面

需要用到的权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /><uses-permission android:name="android.permission.INTERNET"/>

//判断当前网络是否可用public boolean note_Intent(Context context) {      ConnectivityManager con = (ConnectivityManager) context          .getSystemService(Context.CONNECTIVITY_SERVICE);      NetworkInfo networkinfo = con.getActiveNetworkInfo();      if (networkinfo == null || !networkinfo.isAvailable()) {      // 当前网络不可用           Toast.makeText(context.getApplicationContext(), "当前网络不可用",          Toast.LENGTH_SHORT).show();          return false;      }      boolean wifi = con.getNetworkInfo(ConnectivityManager.TYPE_WIFI)          .isConnectedOrConnecting();      if (!wifi) { // 提示使用wifi           Toast.makeText(context.getApplicationContext(), "建议您使用WIFI以减少流量！",          Toast.LENGTH_SHORT).show();      }      return true;    }

跳转到系统设置WIFI界面中

Intent localIntent = new Intent();localIntent.setComponent(new ComponentName("com.android.settings","com.android.settings.wifi.WifiPickerActivity"));startActivityForResult(localIntent, 100);

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